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A shop sells one-pound bags of peanuts for $2 and three-pound bags of peanuts for $5.
If 9 bags are purchased for a total cost of $36, how many three-pound bags were
purchased?

  • math -

    O + T = 9

    T = 9 - O

    2O + 5T = 36

    Substitute 9-O for T in last equation and solve for O. Insert that value into the first equation and solve for T. Check by inserting both values into the second equation.

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